people die outside the worldborder

hi, i got a survival server.
and the border for world 'world' is 330k - (165k for each direction)

some people on my server traveling in the nether and build a nether protal to go outside to the world,
they spawned outside the border and died, what can i do ab it?
is there an option to disable that?

i thought the game wont let the nether portal spawn outside the border no matter what,
do i need to set a border for world_nether as well?

cause i really dont want that...

 

im trying to look for a plugin like that but i cant find